Sounds a little like the Dirk Bogarde film from 1954 They Who Dare. But that's about a group of SAS and Greek soldiers who go to blow up Italian airfields on Rhodos. And it's in colour.
Or there's Ill Met by Moonlight by Powell and Pressburger, again with Dirk. This is in monochrome and is a version of the real capture of General Kreipe of the Fallschirmjäger on Kriti by the British and Greek partisans.

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